Abstract
Soybean contains a range of compounds with putative health benefits including isoflavones and tocopherols. A study was conducted to determine the effects on these compounds of high temperature stress imposed at specific development stages [i.e., none, pre-emergence, vegetative, early reproductive (R1-4), late-reproductive (R5-8), or all stages]. Two cultivars (AC Proteina and OAC Champion) were grown in growth chambers set at contrasting temperatures [i.e., stress conditions of 33/25 °C (day/night temperature) and control conditions of 23/15 °C] in order to generate these treatments. Isoflavone and tocopherol concentrations in mature seeds were determined using high-performance liquid chromatography. In both cultivars isoflavone response was greatest when stress occurred during the R5-8 stages and during all development stages, these treatments reducing total isoflavone concentration by an average of 85% compared to the control. Stress imposed at other stages also affected isoflavone concentration although the response was smaller. For example, stress during the vegetative stages reduced total isoflavones by 33% in OAC Champion. Stress imposed pre-emergence had an opposite effect increasing daidzein concentration by 24% in AC Proteina. Tocopherol concentrations were affected the most when stress was imposed during all stages of development, followed by stress restricted to stages R5-8; response to stress during other stages was limited. The specific response of tocopherols differed, α-tocopherol being increased by high temperature by as much as 752%, the reverse being observed for δ-tocopherol and γ-tocopherol. The present study demonstrates that while isoflavone and tocopherol concentrations in soybeans are affected the most by stress occurring during seed formation, concentrations can also be affected by stress occurring at other stages including stages as early as pre-emergence.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 8
Claim · model-written summary
High temperature at R5-8 and all stages reduced total seed isoflavones by an average of 85% against control in both cultivars.
- Taxon
- Soybean
Glycine maxt0 - Treatment
- stress occurred during the R5-8 stages and during all development stagese0
- Outcome
- total isoflavone concentratione0
- Direction
- reducinge0
- Value
- 85%e0
- Qualifier
- both cultivarse0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In both cultivars isoflavone response was greatest when stress occurred during the R5-8 stages and during all development stages, these treatments reducing total isoflavone concentration by an average of 85% compared to the control”
t0“Soybean”
Claim · model-written summary
Vegetative stage heat stress reduced total isoflavones by 33% in OAC Champion.
- Taxon
- SoybeanGlycine maxt0
- Material
- OAC Champione0
- Treatment
- stress during the vegetative stagese0
- Outcome
- total isoflavonese0
- Direction
- reducede0
- Value
- 33%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stress during the vegetative stages reduced total isoflavones by 33% in OAC Champion”
t0“Soybean”
Claim · model-written summary
Pre-emergence heat stress increased daidzein by 24% in AC Proteina.
- Taxon
- SoybeanGlycine maxt0
- Material
- AC Proteinae0
- Treatment
- Stress imposed pre-emergencee0
- Outcome
- daidzein concentratione0
- Direction
- increasinge0
- Value
- 24%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stress imposed pre-emergence had an opposite effect increasing daidzein concentration by 24% in AC Proteina”
t0“Soybean”
Claim · model-written summary
Stress at other stages also affected isoflavones, with a smaller response.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- Stress imposed at other stagese0
- Outcome
- isoflavone concentratione0
- Qualifier
- the response was smallere0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stress imposed at other stages also affected isoflavone concentration although the response was smaller”
t0“Soybean”
Claim · model-written summary
Tocopherol concentrations responded most to stress over all stages, followed by R5-8 stress.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- stress was imposed during all stages of developmente0
- Outcome
- Tocopherol concentrationse0
- Comparator
- stress restricted to stages R5-8e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tocopherol concentrations were affected the most when stress was imposed during all stages of development, followed by stress restricted to stages R5-8; response to stress during other stages was limited”
t0“Soybean”
Claim · model-written summary
High temperature increased alpha tocopherol by as much as 752%.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- high temperaturee0
- Outcome
- α-tocopherole0
- Direction
- increasede0
- Value
- 752%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“α-tocopherol being increased by high temperature by as much as 752%”
t0“Soybean”
Claim · model-written summary
High temperature decreased delta tocopherol.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- δ-tocopherole0
- Direction
- decreaseinferrede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the reverse being observed for δ-tocopherol”
t0“Soybean”
Claim · model-written summary
High temperature decreased gamma tocopherol.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- γ-tocopherole0
- Direction
- decreaseinferrede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the reverse being observed for δ-tocopherol and γ-tocopherol”
t0“Soybean”
The same questions in other papers
herbicide · molecular: metabolites · Glycine max (soybean)Positive and negative results
13 papers in the same direction as this paper · 4 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- negative
- no effect
15 papers more in this group
See all 19 papers →heat · molecular: metabolites · Glycine max (soybean)Positive and negative results
13 papers in the same direction as this paper · 7 in the opposite direction · 1 reporting no difference from an alternative
- negative
- positive
- negative
18 papers more in this group
See all 22 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.